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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f0ab9bb022fcf3a19d9446d512b9ff62ad4d9ac75d48dc1bfa376e48c80900af' 
  AND token = 'ery1Rm/6Qd/Bf+QbVuY69rueiVO6NAdKUfPOeMR1p0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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