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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2492311380c665290b482d86459f56fe19f9109e97594df52da6cee9c09c050' 
  AND token = 'UFuHkrH0DUy4V2YHxxXV6bKJi8FcfUOQfckz1tNlFCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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