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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '3825eb72cfacc102849abacf471a2e6c963a197981ad903d9930e853f189780a' 
  AND token = 'kA6E59o7zObF6S0aYPbR/12YvozCunSN6sIKmr3okpk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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