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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ad8b0fff54d5b68ffae5ab554c1c583755ff9fa9cac33168a94f78822a0f377' 
  AND token = 'I5TuqREXpE2UohftLVGYVVral5TW08Wj1CFNO+kAjkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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