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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc32ca4268431ec4c23f0b53927b3bcd5f5861bf00d04c535335acbac1c0e486' 
  AND token = 'qDB/7x5rc2GYftRSjUDQ8y9lDOgl0f57egOA0nDLv30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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