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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c45f213c2e26e77e7f77c341f331036f81710d23d19d87ba6995095e206cbb3d' 
  AND token = 'NaiYOJ+Sy38cSh5H7GHmDx8etU8Rn0mNcOpD6l0bkaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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