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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '074183857787d436ab9633867b7dca2f19ce7e222a5aa5349c8072fc1b85a2d7' 
  AND token = 'lKe67ebQqFF+g4SCj/5NLM8t+/BR98CVLHla7kjRHbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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