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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '51846e67e5576dc91a17ce8e0bba6d6269282c55d0d37b33f7e5992d3561255f' 
  AND token = 'KF3Lqd1Crpfc1xhskN9t7qSUwXRoL6+ivbMnqnr+cnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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