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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e7b946b1be4252f417ffbbe077151c91ce95d25b7f9c43a3831f6e870d19ae38' 
  AND token = 'i9YtkXOBDsn4mxr4KC2hSxBevTzUuOwMf58FxrR1Lsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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