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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b58e365af784ba9158aa1346451186f016763c73816ec1aea4a2872a82df3bd3' 
  AND token = '5bGXhkk6t7zu9Xh2l7XZ33zH2YIxBdnQ/ltFxF+7ZEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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