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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '252cc1bd1f713f9637b28870e22edf2b607069359f02834ce453ba398c92066d' 
  AND token = 'GTleO1AYaABLIR1klphy26YZuEMUnNZRRAgRVFIJcMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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