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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0051003afc71c5cd754e81fea34f11a13151178ad68f46842c0791e08f1d448a' 
  AND token = '6GXS5JF/W/EYvZElIqf/QNlgksTlWTO9xlBbfqrIfhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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