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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8b7f1eaa66c5486b027eecfef3d9c84f4004aa0af2044c2e2ec75f0e2d41250e' 
  AND token = 'NWjxB1jLHXzihlBBZoS4onQ4acnQCtnCJE2CQeD4Zuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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