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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ffe24f5cca209e48cf6ca93a5829db6bcd5bd015e78d8a2e11b5368b684a3cb0' 
  AND token = 'VA2SGNNCuaNXGh9Mg77Ifc2tL4HyykWj2UoYOaF7PS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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