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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dcaf7e2336c85042ec2ca5a8d4ac70fe6306e5c2dec682fdcdcd755b36b1f485' 
  AND token = 'Fs4hXsxaSexexH4y+oJlF2h6iM0s5zWHcIwtfTPbhuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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