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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e9e4c8e7ad20481dc2f03a50490478d1ce7c6f59f1316f4104cd0e69f30431f7' 
  AND token = 'tENylnbwRS8xehPgIaJhhFaHkrs3vWMwe5PuyYSO06w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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