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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '52952d732c9ae10748cc7553c1ba664aa0f7d6040640bbe5af076fba8edfc577' 
  AND token = 'oTer4fIRTv7s4i6rZHWSZJLlJbJ6Rnz0YWWDP7+/pDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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