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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f6286dfb4a74e6f5bb72d3faae6b92ed8173a9291f754bd1c0f11cb49256873b' 
  AND token = '7EaIHpQTCeP39ixNJs+112WMLmlrRArIZPS5QPpHcuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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