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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd18d7d04286abe85dadd6d20770b69850c45be013b47c68c1282420b90e1951a' 
  AND token = 'y/ZXdWwsHNLFo8C5VDG0SuBFDZc557mfe4kMsGRIWbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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