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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5fc2cca3a8e4c8b50472d9b2163eff09f0d92c126f5fb6feaf99edac6761f837' 
  AND token = 'VDZ+td3D0R01wq8cyYqw4K0M4HVpj2Jp1Z99w7v61SY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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