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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '597ad0c2c20204a0e16bb003a04408aa3e492ab253486ff29ab2cf049ed93510' 
  AND token = 'GR51445tFCSdwGIrXhAMbfTJjSh+bltdm/GXD7vDi6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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