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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '597b9b5fa994991c248d0c10924c870c229e3a6140fca110d13ac08e96e5c2e0' 
  AND token = 'p2WLPgKf5imR1SH+FKseKgPsPtIeKigz+0b4AsM6nGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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