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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c3566937a0ce0db85b40769b6473ba144e5caad565c0e9b03e6bfa61a062e5b5' 
  AND token = 'ggD35lDiiUaFZDwEqvQXSk7nEE+2XiqbqoE3IDRr56U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}