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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5f03a0da9d00db3e30d4235fb5e24ab1afc542a839c59b75a48a2aa0d2bbfe27' 
  AND token = 'otd+D6jxanwFEYsHGrq48nI2M64jQIW+EBEWEeH2bCs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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