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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a814ef49c5609d288ce7879833d1bf7bc89ebb09426a5447eeeacb44c415514b' 
  AND token = 'hsUULMbyDyRgkAGuErlDZ8aravX5SWybYYoNV3wtySQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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