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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '5aaf3f6d8689f5b894e5d2907ca65842edb7219befa93f4689ebeb228edeaec1' 
  AND token = 'HVO6fUbF+ohP3QB14F2bbSBMuOp8ABcSlSmwOZs2PTM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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