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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '6e7a73b587401a9f5584514d23bd9950f8b3dba67aa9d6af32192f42a9ea5ba0' 
  AND token = 'uOByxovigSKt1dzzkCy+qHBPE2eq2yi5qNyC/WoAFlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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