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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2ac3f47c6e69be944546168029e5440a134f10ace5d4ac3cd5e5986095af6d96' 
  AND token = 'Nlbk5+seP2Fub3nc/fzd17iCXNpSOgaA0zKL2CEs8WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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