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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e0e22442eaef1c309ff7ea94289500fefd10ac7d2fb27da15dd5e7274c0dee13' 
  AND token = 'LUrxelHM56n2XkwjMGC7KwZ0Y4MmKP/AyIrCBXVIeWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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