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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8452664dcd3f5320ac5fc4c469688a0c3ba419bed8a1166bfa58bcde9b36b4f3' 
  AND token = '5KbfQfJTIIjyDvWLD801e4/3Ng0og0kdf7yEQOQADIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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