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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8a433d0e96b5bbaf6e50e4fee3ee8580fc9876d8986649194eaaf89b82e7863a' 
  AND token = '6rz5RgHrrEZMCa1i6e9VuuJvog/9dtmVg8s4PFjull4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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