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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '06df977fdb51b1ef7bf56d5e7ce32bb5c4a8ea4195b044c0a1a64ff8c17f3149' 
  AND token = 'u2w9SguFqkkf2M4En3xz+CrmjkIMmCmj6ub121js+lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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