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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'dc8e5ea0eb0c36fae2188d167a2fd7359302453c8352caf4577c23a516483861' 
  AND token = 'WlEbJ3mR6kh7qlzn1+etly5Kh2p0F5p9kW7F4IPqS28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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