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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '59db809e352d84ffaa6968fd8f3f413ceede7bac56bb41150538a50fe48a5bbd' 
  AND token = 'lkANEt+U3ezBlZnspMPwmDQNSYepoizRVl1WOvaeDFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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