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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66c2721fe199d1b8307d5ad13b159e095aaecd8e5c6a98e2ecaf98569d428a5f' 
  AND token = 'vA1Rjz+Q0p3QpZRvz1G0+/41NgbSFDMpDBbP9C7J+TE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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