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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '60cef9d9c28489199be6a116f219df67766f29078c91122bf4e3c7bc0c8f8bad' 
  AND token = '3imbfJZoin6FuEUFACD8PWthVvmPUOPgwbvPNWJjoWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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