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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '70a557b079f0aebce0b6b3f775bbd1cf1a8db99cd47aa17ed49e56d56750128b' 
  AND token = 'SC8B3S60KVrwGjWctAYAnk73v2pbee0kE0mqiZlVhv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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