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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4c662e265330a6ed4bb473792a9b7e521e785b5a63d96140d79f3e0a3d6f1497' 
  AND token = 'eCmtXDuEfhmvnT6i6SbbmGeh6AU66H31CS7UFlGVkts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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